Steel ingot



July 7, 1931. w, E 1,813,507

r STEEL INGOT 7 Original Filed Jan. 28, 1926 NEUTRAL STRESS //V7E/?/VALLY INVENTQR William/7a! Ramaye Patented July 7, 1931 UNITED" STATES PATENT OFFICE WILLfAM HZAIG RAMAGE, OF GIRARD, OHIO, ASSIGNOR TO VALLEY MOULD & IRON GORPORAZEION, OF SHARIRSVILLE, PENNSYLVANIA, A. CORPORATION OF NEW YORK srn nr. moor Original application filed January 28, 1926, Serial No. 84,807. Divided and this application filed January 24, 1927. Serial No. 162,974.

' The present invention relates to metallurgy and more specially to a steel lngot.

This is a division of my rior appl1cat1on Serial Number 84,307, filed anuary 28, 1926, 5 which application eventuated into Patent No. 1,721,490, granted July 16, 1929. Th1s patent discloses and claims an ingot mold and the method of making the same, which 1ngot mold may be used to produce an ingot 1n accordance with the present invention, although it may be possible to produce the 1ngot by other means and method. In the general prior pract1ce1n the art it may be observed that ingots when stripped from the mold while still hot from the initial heat are darker in appearance in certain portions than in other portions. Usually when first stripped the corners of the ingot and both ends are dark red or black while the central portion of the side walls will be very much redder in appearance. This fact is due to uneven cooling of the ingot in its formative stage and tends to produce uneven characteristics in the steel in the ingot which 26 are carried through into the final article of manufacture.

,The figure on the drawing diagrammatically illustrates a longitudinal cross-section through an ingot according to thepresent in- 30 vention.

The ingot comprising the present invention is one wherein the steel has been uniformly chilled throughout the length of the ingot, thereby producing uniform crystallization in the steel in the ingot and consequently obviating internal stresses and strains so that when the ingot is fabricated, articles of manufacture made therefrom will be of a more uniform character than when made from the defective ingots heretofore produced. Since the present invention relates primarily to the ingot itself, the view of the drawing illustrates a longitudinal section 1 through an ingot in accordance with the present invention. In this ingot, the side walls are uniformly chilled, as at A and the central portion B of the ingot is under uniform or neutral internal stress, that is, the stresses within the ingot are so uniformly distributed 1 as to counterbalance each other and thus when the ingot is undergoing treatment or fabrication the metal has noinherent stress conditions that are liable to deleteriously affeet the finished product.

Since the present invention is devoted primarily to the ingot as an articleof manufacture and the original application for patent Serial Number 84,307 discloses one means and method of producing this ingot, other means and methods will not be specifically set forth herein; and it is believed sufficient to comply with the patent laws to explain that the present article of manufacture may be produced by providing cooling means, for the molten steel when cast into an ingot mold, so arranged that the heat is absorbed from molten steel in such manner as to maintain the surface of the ingot at substantially a uniform temperature during the freezing of the steel into a solid mass, so that when the ingot is stripped hot from the mold it will present a substantially uniform color throughout its entire surface.

The cross-sectional shape of the ingot is relatively unimportant so far as the present invention is concerned. This cross-sectional shape may be round or substantially square, or rectangular, or with curved sides either convex or concave, the essential characteris tics being that the entire rolling surfaces of the ingot shall have substantially uniform have substantially the same depth of chill as I i the side walls thereof.

Articles fabricated from an ingot in acstantially uniform depth chill throughout the length of the ingot.

3. As an article of manufacture, an ingot of steel having the lonigtudinal surfaces thereof of substantially uniform chill throughout the length of the ingot.

4. As an article of manufacture, an ingot of steel having a substantially uniform skin on the longitudinal surfaces thereof and with themetal in the interior of the ingot in a neutral stress condition.

5. Asan article of manufacture, a steel ingot with the crystaline character of the metal adjacent the surface of the ingot substantially uniform throughout the length of the ingot.

6. A steel ingot which when stripped red hot from an ingot mold is of substantially the same temperature throughout the side surfaces of the entire ingot.

WILLIAM HAIG RAMAGE. 

